Semiconductor device having increased contact area between a source/drain pattern and an active contact

ABSTRACT

A semiconductor device including a substrate including an active pattern; a gate electrode crossing the active pattern; a source/drain pattern adjacent to one side of the gate electrode and on an upper portion of the active pattern; an active contact electrically connected to the source/drain pattern; and a silicide layer between the source/drain pattern and the active contact, the source/drain pattern including a body part including a plurality of semiconductor patterns; and a capping pattern on the body part, the body part has a first facet, a second facet on the first facet, and a corner edge defined where the first facet meets the second facet, the corner edge extending parallel to the substrate, the capping pattern covers the second facet of the body part and exposes the corner edge, and the silicide layer covers a top surface of the body part and a top surface of the capping pattern.

CROSS-REFERENCE TO RELATED APPLICATION

Korean Patent Application No. 10-2018-0082280 filed on Jul. 16, 2018 inthe Korean Intellectual Property Office, and entitled: “SemiconductorDevice,” is incorporated by reference herein in its entirety.

BACKGROUND 1. Field

Embodiments relate to a semiconductor device.

2. Description of the Related Art

Semiconductor devices are beneficial in the electronics industry becauseof their small size, multi-functionality, and/or low fabrication cost.Semiconductor devices may encompass semiconductor memory devices storinglogic data, semiconductor logic devices processing operations of logicdata, and hybrid semiconductor devices having both memory and logicelements.

SUMMARY

The embodiments may be realized by providing a semiconductor deviceincluding a substrate including an active pattern; a gate electroderunning across the active pattern; a source/drain pattern adjacent toone side of the gate electrode and on an upper portion of the activepattern; an active contact electrically connected to the source/drainpattern; and a silicide layer between the source/drain pattern and theactive contact, wherein the source/drain pattern includes a body partincluding a plurality of semiconductor patterns; and a capping patternon the body part, wherein the body part has a first facet, a secondfacet on the first facet, and a corner edge defined where the firstfacet meets the second facet, the corner edge extending parallel to thesubstrate, wherein the capping pattern covers the second facet of thebody part and exposes the corner edge, and wherein the silicide layercovers a top surface of the body part and a top surface of the cappingpattern.

The embodiments may be realized by providing a semiconductor deviceincluding a substrate including an active pattern; a gate electroderunning across the active pattern and extending in a first direction;and a source/drain pattern adjacent to one side of the gate electrodeand on an upper portion of the active pattern, wherein the source/drainpattern includes a body part including a plurality of semiconductorpatterns; and a capping pattern on the body part, wherein the body parthas a first semiconductor pattern that is an outermost one of theplurality of semiconductor patterns, the first semiconductor patternincluding silicon in an amount of about 95 at % to about 100 at %,wherein the capping pattern includes germanium, a germanium content ofthe capping pattern being about 5 at % to about 100 at %, wherein thecapping pattern covers one facet of the first semiconductor pattern andexposes a corner edge of the body part, and wherein the source/drainpattern has a maximum width in the first direction at a level at whichthe corner edge is located.

The embodiments may be realized by providing a semiconductor deviceincluding a substrate including an active pattern; a gate electroderunning across the active pattern and extending in a first direction;and a source/drain pattern adjacent to one side of the gate electrodeand on an upper portion of the active pattern, wherein the source/drainpattern includes a body part including a plurality of semiconductorpatterns; and a capping pattern on the body part, wherein the body partincludes a corner edge that horizontally protrudes in the firstdirection, wherein the capping pattern exposes the corner edge of thebody part, and wherein a germanium content of the capping pattern isgreater than a germanium content of the body part.

BRIEF DESCRIPTION OF THE DRAWINGS

Features will be apparent to those of skill in the art by describing indetail exemplary embodiments with reference to the attached drawings inwhich:

FIG. 1 illustrates a plan view of a semiconductor device according tosome example embodiments.

FIGS. 2A, 2B, and 2C illustrate cross-sectional views respectively takenalong lines A-A′, B-B′, and C-C′ of FIG. 1.

FIGS. 3, 5, 7, 9, 11, and 13 illustrate plan views of stages in a methodof manufacturing a semiconductor device according to some exampleembodiments.

FIGS. 4, 6A, 8A, 10A, 12A, and 14A illustrate cross-sectional viewstaken along line A-A′ of FIGS. 3, 5, 7, 9, 11, and 13, respectively.

FIGS. 6B, 8B, 10B, 12B, and 14B illustrate cross-sectional views takenalong line B-B′ of FIGS. 5, 7, 9, 11, and 13, respectively.

FIGS. 6C, 8C, 10C, 12C, and 14C illustrate cross-sectional views takenalong line C-C′ of FIGS. 5, 7, 9, 11, and 13, respectively.

FIGS. 15, 16, and 17 illustrate cross-sectional views taken along lineD-D′ of FIG. 1, showing a semiconductor device according to some exampleembodiments.

FIG. 18 illustrates a plan view showing a semiconductor device accordingto some example embodiments.

FIGS. 19A, 19B, and 19C illustrate cross-sectional views respectivelytaken along lines A-A′, B-B′, and C-C′ of FIG. 16.

FIGS. 20, 22, 24, 26, and 28 illustrate plan views of stages in a methodof manufacturing a semiconductor device according to some exampleembodiments.

FIGS. 21, 23A, 25A, 27A, and 29A illustrate cross-sectional views takenalong line A-A′ of FIGS. 20, 22, 24, 26, and 28, respectively.

FIGS. 23B, 25B, 27B, and 29B illustrate cross-sectional views takenalong line B-B′ of FIGS. 22, 24, 26, and 28, respectively.

FIGS. 23C, 25C, 27C, and 29C illustrate cross-sectional views takenalong line C-C′ of FIGS. 22, 24, 26, and 28, respectively.

DETAILED DESCRIPTION

FIG. 1 illustrates a plan view of a semiconductor device according tosome example embodiments. FIGS. 2A, 2B, and 2C illustratecross-sectional views respectively taken along lines A-A′, B-B′, andC-C′ of FIG. 1.

Referring to FIGS. 1 and 2A to 2C, a substrate 100 may be provided toinclude a memory cell region. For example, the memory cell region of thesubstrate 100 may be provided thereon with memory cell transistors thatconstitute a plurality of SRAM cells.

A device isolation layer ST may be provided on the substrate 100. Thedevice isolation layer ST may define first and second active patternsAP1 and AP2. The substrate 100 may include a compound semiconductorsubstrate or a semiconductor substrate including silicon, germanium,silicon-germanium, or the like. The device isolation layer ST mayinclude a dielectric material, such as a silicon oxide layer.

The first and second active patterns AP1 and AP2 may be portions of thesubstrate 100. The first and second active patterns AP1 and AP2 mayextend in parallel along a second direction D2. A first trench TR1 maybe defined between a pair of neighboring active patterns AP1 and AP2.The device isolation layer ST may (e.g., at least partially) fill thefirst trench TR1. The first and second active patterns AP1 and AP2 mayhave their upper portions that vertically protrude beyond the deviceisolation layer ST. Each of the upper portions of the first and secondactive patterns AP1 and AP2 may have a fin shape that verticallyprotrudes above the device isolation layer ST.

First channels CH1 and first source/drain patterns SD1 may be providedon the upper portion of each of the first active patterns AP1. Forexample, the first source/drain pattern SD1 may fill a recess RS formedon the upper portion of the first active pattern AP1. Second channelsCH2 and second source/drain patterns SD2 may be provided on the upperportion of each of the second active patterns AP2. The firstsource/drain patterns SD1 may be p-type impurity regions. The secondsource/drain patterns SD2 may be n-type impurity regions. Each of thefirst channels CH1 may be between a pair of the first source/drainpatterns SD1, and each of the second channels CH2 may be between a pairof the second source/drain patterns SD2.

The first and second source/drain patterns SD1 and SD2 may be epitaxialpatterns formed by a selective epitaxial growth process. The first andsecond source/drain patterns SD1 and SD2 may have their top surfaces ata higher level (e.g., farther from the substrate 100) than that of topsurfaces of the first and second channels CH1 and CH2. The first andsecond source/drain patterns SD1 and SD2 may include a semiconductorelement that is the same as or different from that of the substrate 100.The first source/drain patterns SD1 may include a semiconductor elementwhose lattice constant is greater than that of the semiconductor elementof the substrate 100. The first source/drain patterns SD1 may thereforeprovide the first channel region CH1 with compressive stress. The firstsource/drain patterns SD1 may include, e.g., silicon-germanium (SiGe).The second source/drain patterns SD2 may include the same semiconductorelement as that of the substrate 100. The second source/drain patternSD2 may include, e.g., silicon (Si).

Gate electrodes GE may be provided to extend in a first direction D1,while running across the first and second active patterns AP1 and AP2.The gate electrodes GE may vertically overlap the first and secondchannels CH1 and CH2. For example, the gate electrodes GE may includeone or more of conductive metal nitride (e.g., titanium nitride ortantalum nitride) and metal (e.g., titanium, tantalum, tungsten, copper,or aluminum).

A dielectric pattern IL may be between the gate electrodes GE adjacentto each other in the first direction D1. The dielectric pattern IL mayseparate adjacent gate electrodes GE from each other.

A pair of gate spacers GS may be on opposite sidewalls of each of thegate electrodes GE. The gate spacers GS may extend in the firstdirection D1 along the gate electrodes GE. The gate spacers GS may havetop surfaces that are higher than those of the gate electrodes GE. Thetop surfaces of the gate spacers GS may be coplanar with that of a firstinterlayer dielectric layer 110, which will be discussed below. The gatespacers GS may include one or more of SiO₂, SiCN, SiCON, and SiN. In animplementation, the gate spacers GS may include a multiple layer thatconsists of two or more of SiO₂, SiCN, SiCON, and SiN.

Gate dielectric patterns GI may be between the gate electrode GE and thefirst active pattern AP1 and between the gate electrode GE and thesecond active pattern AP2. Each of the gate dielectric patterns GI mayextend along a bottom surface of one of the gate electrode GE. Each ofthe gate dielectric patterns GI may cover the top surface and oppositesidewalls of one of the first and second channels CH1 and CH2. The gatedielectric patterns GI may include a high-k dielectric material. Forexample, the high-k dielectric material may include one or more ofhafnium oxide, hafnium silicon oxide, lanthanum oxide, zirconium oxide,zirconium silicon oxide, tantalum oxide, titanium oxide, bariumstrontium titanium oxide, barium titanium oxide, strontium titaniumoxide, lithium oxide, aluminum oxide, lead scandium tantalum oxide, andlead zinc niobate.

A gate capping pattern GP may be provided on each of the gate electrodesGE. The gate capping patterns GP may extend in the first direction D1along the gate electrodes GE. The gate capping pattern GP may be betweena pair of the gate spacers GS. The gate capping patterns GP may includea material having an etch selectivity with respect to first, second,third, and fourth interlayer dielectric layers 110, 120, 130, and 140,which will be discussed below. For example, the gate capping patterns GPmay include one or more of SiON, SiCN, SiCON, and SiN.

A first interlayer dielectric layer 110 may be provided on the substrate100. The first interlayer dielectric layer 110 may cover the gatespacers GS and the first and second source/drain patterns SD1 and SD2.The first interlayer dielectric layer 110 may have a top surface that issubstantially coplanar with those of the gate capping patterns GP andthose of the gate spacers GS. The first interlayer dielectric layer 110may be provided thereon with a second interlayer dielectric layer 120that covers the top surfaces of the gate capping patterns GP and the topsurfaces of the gate spacers GS.

Active contacts AC may be provided between the gate electrodes GE. Theactive contacts AC may penetrate the second interlayer dielectric layer120 and the first interlayer dielectric layer 110, and may then becoupled to the first and second source/drain patterns SD1 and SD2. Theactive contacts AC may have top surfaces coplanar with that of thesecond interlayer dielectric layer 120.

Each of the active contacts AC may include a conductive pattern FM and abarrier pattern BM surrounding the conductive pattern FM. The barrierpattern BM may cover sidewalls and a bottom surface of the conductivepattern FM. The conductive pattern FM may include metal, e.g., one ormore of aluminum, copper, tungsten, molybdenum, and cobalt. The barrierpattern BM may include a metal layer and a metal nitride layer. Themetal layer may include one or more of titanium, tantalum, tungsten,nickel, cobalt, and platinum. The metal nitride layer may include one ormore of a titanium nitride (TiN) layer, a tantalum nitride (TaN) layer,a tungsten nitride (WN) layer, a nickel nitride (NiN) layer, a cobaltnitride (CoN) layer, and a platinum nitride (PtN) layer.

A silicide layer SC may be between each of the first and secondsource/drain patterns SD1 and SD2 and the active contact ACcorresponding to the each of the first and second source/drain patternsSD1 and SD2. The active contact AC may be electrically connected throughthe silicide layer SC either to the first source/drain pattern SD1 or tothe second source/drain pattern SD2. The silicide layer SC may includemetal silicide, e.g., one or more of titanium silicide, tantalumsilicide, tungsten silicide, nickel silicide, and cobalt silicide.

Gate contacts GC may be provided on the gate electrodes GE. Each of thegate contacts GC may be coupled to the gate electrode GE, whilepenetrating the second interlayer dielectric layer 120, the firstinterlayer dielectric layer 110, and the gate capping pattern GP. Thegate contacts GC may have top surfaces coplanar with that of the secondinterlayer dielectric layer 120. The gate contacts GC may have bottomsurfaces higher than those of the active contacts AC.

Each of the gate contacts GC may include a conductive pattern FM and abarrier pattern BM surrounding the conductive pattern FM. The conductivepattern FM and the barrier pattern BM of the gate contact CG may besubstantially the same respectively as the conductive pattern FM and thebarrier pattern BM of the active contact AC discussed above. Forexample, the gate contact GC and its connected active contact AC mayconstitute a single conductive structure.

The first source/drain pattern SD1 will be further discussed in detailwith reference back to FIGS. 2A and 2B. The first source/drain patternSD1 may include a body part BP and a capping pattern CAP on the body patBP. The body part BP may include a first semiconductor pattern SP1, asecond semiconductor pattern SP2, a third semiconductor pattern SP3, anda fourth semiconductor pattern SP4.

The first semiconductor pattern SP1 may cover an inner wall of therecess RS. The first semiconductor pattern SP1 may have a U shape whenviewed in cross-section taken along the second direction D2 (see FIG.2A). For example, the first semiconductor pattern SP1 may be conformallyformed to have a uniform thickness on the inner wall of the recess RS.

The first semiconductor pattern SP1 may be provided thereon with thesecond semiconductor pattern SP2 that covers an inner wall of the firstsemiconductor pattern SP1. The second semiconductor pattern SP2 may havea U shape when viewed in cross-section taken along the second directionD2.

The second semiconductor pattern SP2 may be provided thereon with thethird semiconductor pattern SP3 that covers an inner wall of the secondsemiconductor pattern SP2. The second semiconductor pattern SP2 may bebetween the first semiconductor pattern SP1 and the third semiconductorpattern SP3. The first, second, and third semiconductor patterns SP1,SP2, and SP3 may completely fill the recess RS.

Each of the first, second, and third semiconductor patterns SP1, SP2,and SP3 may include a semiconductor element whose lattice constant isgreater than that of a semiconductor element included in the substrate100. For example, when the substrate 100 includes silicon (Si), thefirst, second, and third semiconductor patterns SP1, SP2, and SP3 mayinclude silicon-germanium (SiGe). Germanium (Ge) may have a greaterlattice constant than that of silicon (Si).

The first semiconductor pattern SP1 may serve as a buffer layer betweenthe substrate 100 and the second semiconductor pattern SP2. The firstsemiconductor pattern SP1 may contain germanium (Ge) whose concentrationis relatively low. For example, the first semiconductor pattern SP1 maycontain germanium (Ge) in an amount of about 10 at % to about 30 at %.The second semiconductor pattern SP2 may contain germanium (Ge) in anamount that is greater than that of germanium (Ge) contained in thefirst semiconductor pattern SP1. For example, the second semiconductorpattern SP2 may have a germanium (Ge) content of about 25 at % to about50 at %. The third semiconductor pattern SP3 may contain germanium (Ge)in an amount that is greater than that of germanium (Ge) contained inthe second semiconductor pattern SP2. For example, the thirdsemiconductor pattern SP3 may have a germanium (Ge) content of about 40at % to about 75 at %.

The first, second, and third semiconductor patterns SP1, SP2, and SP3may include impurities (e.g., boron) that cause the first source/drainpattern SD1 to have p-type conductivity. The third semiconductor patternSP3 may have an impurity concentration (e.g., at %) that is greater thanthat of the second semiconductor pattern SP2. The impurity concentrationof the second semiconductor pattern SP2 may be greater than that of thefirst semiconductor pattern SP1.

The fourth semiconductor pattern SP4 may be provided on the thirdsemiconductor pattern SP3. The fourth semiconductor pattern SP4 maycover an exposed surface of the third semiconductor pattern SP3. Thefourth semiconductor pattern SP4 may act as a capping layer thatprotects the third semiconductor pattern SP3. The fourth semiconductorpattern SP4 may include the same semiconductor element as that of thesubstrate 100. For example, the fourth semiconductor pattern SP4 mayinclude single crystalline silicon (Si). The fourth semiconductorpattern SP4 may include silicon (Si) in an amount of about 95 at % toabout 100 at %.

The following will discuss a cross-section in the first direction D1 ofthe first source/drain pattern SD1 with reference back to FIG. 2B. Thebody part BP may include a first facet FA1, a second facet FA2, a thirdfacet FA3, and a fourth facet FA4. The first to fourth facets FA1 to FA4may be surfaces of the fourth semiconductor pattern SP4. The first tofourth facets FA1 to FA4 may be substantially the same crystal plane.The first to fourth facets FA1 to FA4 may be (111) planes.

A first corner edge SE1 may be defined by (e.g., formed at an interfacebetween) the first and second facets FA1 and FA2 or by the third andfourth facets FA3 and FA4. The first corner edge SE1 may horizontallyprotrude in a direction away from a central line CEN of the first activepattern AP1. For example, the first corner edge SE1 may protrude in thefirst direction D1 or in a reverse direction to the first direction D1.

A second corner edge SE2 may be defined by the second and third facetsFA2 and FA3. The second corner edge SE2 may be aligned with the centralline CEN of the first active pattern AP1. The second corner edge SE2 mayvertically protrude along the central line CEN. For example, the secondcorner edge SE2 may protrude in a third direction D3.

The capping pattern CAP may be provided on the body part BP. The cappingpattern CAP may selectively cover the second and third facets FA2 andFA3 of the body part BP. The capping pattern CAP may not cover the firstand second corner edges SE1 and SE2 of the body part BP. The cappingpattern CAP may expose the first and second corner edges SE1 and SE2 ofthe body part BP. The first and fourth facets FA1 and FA4 of the bodypart BP may not be covered with the capping pattern CAP, and may beexposed.

The capping pattern CAP may have a rounded surface. The capping patternCAP may have a thickness that increases and then decreases approachingthe second corner edge SE2 from the first corner edge SE1. The cappingpattern CAP may include germanium (Ge) or silicon-germanium (SiGe). Thecapping pattern CAP may contain germanium (Ge) in an amount that isgreater than that of germanium (Ge) in the third semiconductor patternSP3. The capping pattern CAP may have a germanium (Ge) content of about5 at % to about 100 at %. In an implementation, the germanium (Ge)content of the capping pattern CAP may be about 95 at % to about 100 at%.

The first source/drain pattern SD1 may have a maximum width MW in thefirst direction D1 at a level at which the first corner edge SE1 of thebody part BP is located. The maximum width MW of the first source/drainpattern SD1 may be substantially the same as that of the body part BP.This may be because that the capping pattern CAP does not cover thefirst corner edge SE1 but selectively covers the second facet FA2 andthe third facet FA3.

When the active contact AC is provided on the first source/drain patternSD1, the capping pattern CAP may increase a contact area between thefirst source/drain pattern SD1 and the active contact AC (or thesilicide layer SC). This may be because that the body part BP, thecapping pattern CAP, and the active contact AC have therebetween acontact area greater than that between the body part BP and the activecontact AC.

Because the first source/drain pattern SD1 maintains its maximum widthMW even when the capping pattern CAP is additionally provided on thebody part BP, a spacing margin may be securely obtained between thefirst source/drain patterns SD1 adjacent to each other. In such cases,an increase in contact area between the first source/drain pattern SD1and the active contact AC may help improve electrical characteristics ofa semiconductor device according to some example embodiments.Furthermore, an electrical short between neighboring first source/drainpatterns SD1 may be reduced or prevented to enhance reliability of asemiconductor device according to some example embodiments.

FIGS. 3, 5, 7, 9, 11, and 13 illustrate plan views of stages in a methodof manufacturing a semiconductor device according to some exampleembodiments. FIGS. 4, 6A, 8A, 10A, 12A, and 14A illustratecross-sectional views taken along line A-A′ of FIGS. 3, 5, 7, 9, 11, and13, respectively. FIGS. 6B, 8B, 10B, 12B, and 14B illustratecross-sectional views taken along line B-B′ of FIGS. 5, 7, 9, 11, and13, respectively. FIGS. 6C, 8C, 10C, 12C, and 14C illustratecross-sectional views taken along line C-C′ of FIGS. 5, 7, 9, 11, and13, respectively.

Referring to FIGS. 3 and 4, a substrate 100 may be patterned to formfirst and second active patterns AP1 and AP2. For example, the formationof the first and second active patterns AP1 and AP2 may include formingmask patterns on the substrate 100, and using the mask patterns as anetching mask to anisotropically etch the substrate 100. A first trenchTR1 may be formed between a pair of neighboring active patterns AP1 andAP2.

A device isolation layer ST may be formed on the substrate 100, fillingthe first trench TR1. For example, a dielectric layer (e.g., a siliconoxide layer) may be formed on the substrate 100, covering the first andsecond active patterns AP1 and AP2. The dielectric layer may be recesseduntil upper portions of the first and second active patterns AP1 and AP2are exposed.

Referring to FIGS. 5 and 6A to 6C, sacrificial patterns PP may be formedto run across the first and second active patterns AP1 and AP2. Each ofthe sacrificial patterns PP may have a linear shape that extends in afirst direction D1. For example, the formation of the sacrificialpatterns PP may include forming a sacrificial layer on an entire surfaceof the substrate 100, forming mask patterns MA on the sacrificial layer,and using the mask patterns MA as an etching mask to pattern thesacrificial layer. The sacrificial layer may include a polysiliconlayer.

A pair of gate spacers GS may be formed on opposite sidewalls of each ofthe sacrificial patterns PP. The gate spacers GS may also be formed onopposite sidewalls of the upper portion of each of the first and secondactive patterns AP1 and AP2. The formation of the gate spacers GS mayinclude conformally forming a spacer layer on the entire surface of thesubstrate 100 and anisotropically etching the spacer layer. The spacerlayer may include one or more of SiO₂, SiCN, SiCON, and SiN. In animplementation, the spacer layer may include a multiple layer thatconsists of two or more of SiO₂, SiCN, SiCON, and SiN.

Referring to FIGS. 7 and 8A to 8C, recesses RS may be formed on theupper portion of each of the first and second active patterns AP1 andAP2. A pair of the recesses RS may be formed on opposite sides of eachof the sacrificial patterns PP. The formation of the recesses RS mayinclude performing an etching process in which the mask patterns MA andthe gate spacers GS are used as an etching mask to etch the upperportions of the first and second active patterns AP1 and AP2. Theetching process may remove the gate spacers GS on the opposite sidewallsof the upper portion of each of the first and second active patterns AP1and AP2. An exposed device isolation layer ST may be recessed during theetching process.

Referring to FIGS. 9 and 10A to 10C, a first hardmask pattern MP may beformed to selectively cover the second active patterns AP2. The firsthardmask pattern MP may include an opening OP that exposes the firstactive patterns AP1.

First source/drain patterns SD1 may be formed to fill the recesses RS ofthe first active patterns AP1 exposed to the opening OP. For example,the formation of the first source/drain patterns SD1 may includeperforming a selective epitaxial growth process in which exposed innerwalls of the recesses RS are used as seed layers. A first channel CH1may be defined between a pair of the first source/drain patterns SD1.For example, the selective epitaxial growth process may include achemical vapor deposition (CVD) process or a molecular beam epitaxy(MBE) process.

Each of the first source/drain patterns SD1 may include a secondsemiconductor element whose lattice constant is greater than that of afirst semiconductor element included in the substrate 100. For example,the first semiconductor element may be silicon, and the secondsemiconductor element may be germanium. Each of the first source/drainpatterns SD1 may be formed to have a plurality of semiconductor layers.Each of the first source/drain patterns SD1 may include first to fourthsemiconductor patterns SP1 to SP4 and a capping pattern CAP that aresequentially formed. The first to fourth semiconductor patterns SP1 toSP4 may constitute a body part BP, and the capping pattern CAP may beformed on the body part BP.

The first semiconductor pattern SP1 may be formed by a first selectiveepitaxial growth process in which the inner wall of the recess RS of thefirst active pattern AP1 is used as a seed layer. The firstsemiconductor pattern SP1 may contain the second semiconductor elementwhose concentration is low. The first semiconductor pattern SP1 may bedoped to include low concentration impurities. For example, the firstsemiconductor pattern SP1 may include silicon-germanium (SiGe) in whichboron (B) is doped. The first semiconductor pattern SP1 may containgermanium (Ge) in an amount of about 10 at % to about 30 at %.

The second semiconductor pattern SP2 may be formed by a second selectiveepitaxial growth process in which the first semiconductor pattern SP1 isused as a seed layer. The second semiconductor pattern SP2 may containthe second semiconductor element at a concentration that is is greaterthan that of the second semiconductor element contained in the firstsemiconductor pattern SP1. The second semiconductor pattern SP2 may bedoped to include impurities at a concentration that is greater than thatof impurities included in the first semiconductor pattern SP1. Forexample, the second semiconductor pattern SP2 may includesilicon-germanium (SiGe) in which boron (B) is doped. The secondsemiconductor pattern SP2 may contain germanium (Ge) in an amount ofabout 25 at % to about 50 at %.

The third semiconductor pattern SP3 may be formed by a third selectiveepitaxial growth process in which the second semiconductor pattern SP2is used as a seed layer. The third semiconductor pattern SP3 may containthe second semiconductor element at a concentration that is greater thanthat of the second semiconductor element contained in the secondsemiconductor pattern SP2. The third semiconductor pattern SP3 may bedoped to include impurities at a concentration that is greater than thatof impurities included in the second semiconductor pattern SP2. Forexample, the third semiconductor pattern SP3 may includesilicon-germanium (SiGe) in which boron (B) is doped. The thirdsemiconductor pattern SP3 may contain germanium (Ge) in an amount ofabout 40 at % to about 75 at %.

The fourth semiconductor pattern SP4 may be formed by a fourth selectiveepitaxial growth process in which the third semiconductor pattern SP3 isused as a seed layer. The fourth semiconductor pattern SP4 mayconformally cover a surface of the third semiconductor pattern SP3. Thefourth semiconductor pattern SP4 may contain the first semiconductorelement that is the same as that of the substrate 100. For example, thefourth semiconductor pattern SP4 may include single crystalline silicon(Si). The fourth semiconductor pattern SP4 may contain silicon (Si) inan amount of about 95 at % to about 100 at %.

The fourth semiconductor pattern SP4 may include a first facet FA1, asecond facet FA2, a third facet FA3, and a fourth facet FA4. Forexample, the body part BP may include the first facet FA1, the secondfacet FA2, the third facet FA3, and the fourth facet FA4. The first andsecond facets FA1 and FA2 or the third and fourth facets FA3 and FA4 maydefine a first corner edge SE1 that horizontally protrudes. The secondand third facets FA2 and FA3 may define a second corner edge SE2 thatvertically protrudes.

The capping pattern CAP may be selectively formed on the second andthird facets FA2 and FA3 of the body part BP. The capping pattern CAPmay not be formed on the first and fourth facets FA1 and FA4 of the bodypart BP. The capping pattern CAP may not cover the first corner edgeSE1.

The capping pattern CAP may be formed by a fifth selective epitaxialgrowth process in which the fourth semiconductor pattern SP4 is used asa seed layer. For example, the capping pattern CAP may include germanium(Ge) or silicon-germanium (SiGe). The capping pattern CAP may containgermanium (Ge) in an amount of about 5 at % to about 100 at %. In animplementation, the capping pattern CAP may have a germanium (Ge)content of about 95 at % to about 100 at %.

The fifth selective epitaxial growth process may be performed at atemperature similar to or less than those of the first to fourthselective epitaxial growth processes. The fifth epitaxial growth processmay use a process gas including an etching gas that contains HCl, Cl₂,or a combination thereof. When the fifth selective epitaxial growthprocess is adjusted on its process conditions (e.g., temperature,pressure, and etching gas amount), it may be possible to controlselective growth of the capping pattern CAP only on the second facet FA2and the third facet FA3.

Referring to FIGS. 11 and 12A to 12C, the first hardmask pattern MP maybe removed, and a second hardmask pattern may be formed to selectivelycover the first active patterns AP1. Second source/drain patterns SD2may be formed to fill the recesses RS of the second active patterns AP2exposed to the second hardmask pattern. For example, the formation ofthe second source/drain patterns SD2 may include performing a selectiveepitaxial growth process in which exposed inner walls of the recesses RSare used as seed layers. The second source/drain patterns SD2 mayinclude the same first semiconductor element, such as silicon, as thatof the substrate 100. Afterwards, the second hardmask pattern may beremoved.

A first interlayer dielectric layer 110 may be formed to cover the firstand second source/drain patterns SD1 and SD2, the gate spacers GS, andthe mask patterns MA. For example, the first interlayer dielectric layer110 may include a silicon oxide layer.

The first interlayer dielectric layer 110 may be planarized until topsurfaces of the sacrificial patterns PP are exposed. An etch-back orchemical mechanical polishing (CMP) process may be performed toplanarize the first interlayer dielectric layer 110. As a result, thefirst interlayer dielectric layer 110 may have a top surfacesubstantially coplanar with those of the sacrificial patterns PP andthose of the gate spacers GS.

The sacrificial patterns PP may be replaced with gate electrodes GE anda dielectric pattern IL. For example, an anisotropic etching process maybe performed on the exposed sacrificial patterns PP. The anisotropicetching process may selectively etch the sacrificial patterns PP. Thedielectric pattern IL may be formed in empty spaces where thesacrificial patterns PP are removed. Gate dielectric patterns GI and thegate electrodes GE may be formed in remaining empty spaces where thedielectric pattern IL is not formed.

The gate dielectric patterns GI may be conformally formed by an atomiclayer deposition (ALD) process or a chemical oxidation process. Forexample, the gate dielectric pattern GI may include a high-k dielectricmaterial. The formation of the gate electrodes GE may include forming agate electrode layer on the gate dielectric patterns GI and performing aplanarization process on the gate electrode layer. For example, the gateelectrode layer may include one or more of metal and conductive metalnitride.

The gate electrodes GE may be recessed by selectively etching upperportions thereof. The recessed gate electrodes GE may have their topsurfaces lower than that of the first interlayer dielectric layer 110and those of the gate spacers GS. Gate capping patterns GP may be formedon the recessed gate electrodes GE. The formation of the gate cappingpatterns GP may include forming a gate capping layer to cover therecessed gate electrodes GE and performing a planarization process onthe gate capping layer until the top surface of the first interlayerdielectric layer 110 is exposed. For example, the gate capping layer mayinclude one or more of SiON, SiCN, SiCON, and SiN.

Referring to FIGS. 13 and 14A to 14C, a second interlayer dielectriclayer 120 may be formed on the first interlayer dielectric layer 110,covering the gate capping patterns GP. First contact holes CNH1 may beformed to penetrate the second interlayer dielectric layer 120 and thefirst interlayer dielectric layer 110, exposing the first and secondsource/drain patterns SD1 and SD2. Second contact holes CNH2 may beformed to penetrate the second interlayer dielectric layer 120, thefirst interlayer dielectric layer 110, and the gate capping patterns GP,exposing the gate electrodes GE.

When an etching process is performed to form the first contact holesCNH1, the etching process may etch upper portions of the first andsecond source/drain patterns SD1 and SD2. Silicide layers SC may beformed by performing a silicidation process on the first and secondsource/drain patterns SD1 and SD2 exposed to the first contact holesCNH1. For example, the silicide layers SC may include one or more oftitanium silicide, tantalum silicide, tungsten silicide, nickelsilicide, and cobalt silicide.

Referring back to FIGS. 1 and 2A to 2C, active contacts AC may be formedin the first contact holes CNH1, contacting the first and secondsource/drain patterns SD1 and SD2. Gate contacts GC may be formed in thesecond contact holes CNH2, contacting the gate electrodes GE. Theformation of the active contacts AC and the gate contacts GC may includeforming a barrier pattern BM to partially fill each of the first andsecond contact holes CNH1 and CNH2, and forming a conductive pattern FMon the barrier pattern BM.

FIGS. 15, 16, and 17 illustrate cross-sectional views taken along lineD-D′ of FIG. 1, showing a semiconductor device according to some exampleembodiments. In the embodiment that follows, a repeated detaileddescription of technical features relative to those of the semiconductordevice discussed above with reference to FIGS. 1 and 2A to 2C may beomitted, and a difference thereof will be discussed in detail.

Referring to FIGS. 1, 2A, 2C, and 15, the silicide layer SC may have asurface that conforms to a surface profile of the first source/drainpattern SD1 or the second source/drain pattern SD2 beneath the silicidelayer SC. For example, a shape of the first source/drain pattern SD1 andits overlying silicide layer SC may be similar to that of the firstsource/drain pattern SD1 having no silicide layer SC thereon. Thesilicide layer SC on the first source/drain pattern SD1 may have a topend at a level substantially the same as that of a top end (e.g., thesecond corner edge SE2) of the first source/drain pattern SD1 having nosilicide layer SC thereon.

Referring back to FIGS. 13 and 14A to 14C, the formation of the silicidelayer SC and the active contact AC may include forming the first contactholes CNH1 by performing a selective etching process that selectivelyetches the first and second interlayer dielectric layers 110 and 120except for the first and second source/drain patterns SD1 and SD2. Thefirst and second source/drain patterns SD1 and SD2 may be exposed by theselective etching process, but may maintain their shapes even after thefirst contact holes CNH1 are formed. When a silicidation process isperformed on the exposed first and second source/drain patterns SD1 andSD2, the exposed first and second source/drain patterns SD1 and SD2 maybe converted into the silicide layers SC.

Referring to FIGS. 1, 2A, 2C, and 16, the capping pattern CAP mayinclude a first segment P1 and a second segment P2. The first segment P1may cover the second and third facets FA2 and FA3 of the body part BP,and the second segment P2 may cover the first and fourth facets FA1 andFA4 of the body part BP. The first and second segments P1 and P2 may notcover the first and second corner edges SE1 and SE2 of the body part BP.The second segment P2 may have a maximum thickness less than that of thefirst segment P1.

Referring to FIGS. 1, 2A, 2C, and 17, the capping pattern CAP may notcover the first corner edge SE1 of the body part BP, and may cover thesecond corner edge SE2 of the body part BP. For example, the cappingpattern CAP may have a top end at a higher level than that of the secondcorner edge SE2.

FIG. 18 illustrates a plan view showing a semiconductor device accordingto some example embodiments. FIGS. 19A, 19B, and 19C illustratecross-sectional views respectively taken along lines A-A′, B-B′, andC-C′ of FIG. 16. In the embodiment that follows, a repeated detaileddescription of technical features relative to those discussed above withreference to FIGS. 1 and 2A to 2C may be omitted, and a differencethereof will be discussed in detail.

Referring to FIGS. 18 and 19A to 19C, at least one logic cell may beprovided on a substrate 100. The logic cell may include logictransistors that constitute a logic circuit of a semiconductor device.For example, the logic cell of the substrate 100 may include logictransistors constituting a processor core or an I/O terminal.

The substrate 100 may include a PMOSFET region PR and an NMOSFET regionNR. The PMOSFET region PR and the NMOSFET region NR may be defined by asecond trench TR2 formed on an upper portion of the substrate 100. Forexample, the second trench TR2 may be formed between the PMOSFET regionPR and the NMOSFET region NR. The PMOSFET region PR and the NMOSFETregion NR may be spaced apart in a first direction D1 from each otheracross the second trench TR2. The PMOSFET region PR and the NMOSFETregion NR may extend in a second direction D2 intersecting the firstdirection D1.

The PMOSFET region PR and the NMOSFET region NR may be provided thereonwith a plurality of active patterns AP1 and AP2 that extend in thesecond direction D2. The active patterns AP1 and AP2 may include firstactive patterns AP1 on the PMOSFET region PR and second active patternsAP2 on the NMOSFET region NR. The first and second active patterns AP1and AP2 may be vertically protruding portions of the substrate 100. Afirst trench TR1 may be defined between neighboring first activepatterns AP1 and between neighboring second active patterns AP2. Thesecond trench TR2 may be deeper than the first trench TR1.

A device isolation layer ST may fill the first and second trenches TR1and TR2. The first and second active patterns AP1 and AP2 may have theirupper portions that vertically protrude beyond the device isolationlayer ST.

First channels CH1 and first source/drain patterns SD1 may be providedon the upper portions of the first active patterns AP1. Second channelsCH2 and second source/drain patterns SD2 may be provided on the upperportions of the second active patterns AP2. The first source/drainpatterns SD1 may be p-type impurity regions. The second source/drainpatterns SD2 may be n-type impurity regions. The first and secondsource/drain patterns SD1 and SD2 may be epitaxial patterns formed by aselective epitaxial growth process.

Gate electrodes GE may be provided to extend in the second direction D2,while running across the first and second active patterns AP1 and AP2.The gate electrodes GE may be spaced apart from each other in the firstdirection D1. For example, the gate electrodes GE may include one ormore of metal and conductive metal nitride. A pair of gate spacers GSmay be on opposite sidewalls of each of the gate electrodes GE. Gatedielectric patterns GI may be between the gate electrode GE and thefirst active pattern AP1 and between the gate electrode GE and thesecond active pattern AP2. A gate capping pattern GP may be provided oneach of the gate electrodes GE.

A first interlayer dielectric layer 110 may be provided on the substrate100. The first interlayer dielectric layer 110 may cover the gatespacers GS and the first and second source/drain patterns SD1 and SD2.The first interlayer dielectric layer 110 may be provided thereon with asecond interlayer dielectric layer 120 that covers top surfaces of thegate capping patterns GP and top surfaces of the gate spacers GS.

Active contacts AC may be provided between the gate electrodes GE. Theactive contacts AC may penetrate the second interlayer dielectric layer120 and the first interlayer dielectric layer 110. and may be coupled tothe first and second source/drain patterns SD1 and SD2.

The first source/drain pattern SD1 may be provided on three first activepatterns AP1 adjacent to each other in the first direction D1. Forexample, the first source/drain patterns SD1 on adjacent first activepatterns AP1 may be merged with other to constitute a singlesource/drain pattern.

The first source/drain pattern SD1 may include a body part BP and acapping pattern CAP on the body pat BP. The body part BP may includefirst to fourth semiconductor patterns SP1 to SP4, and may furtherinclude a fifth semiconductor pattern SP5.

The fifth semiconductor pattern SP5 may be provided on the thirdsemiconductor pattern SP3. The fifth semiconductor pattern SP5 may bebetween the third semiconductor pattern SP3 and a silicide layer SC. Thethird semiconductor pattern SP3 may include valleys VAL. The thirdsemiconductor pattern SP3 may have a top surface a portion of which isrecessed toward the substrate 100, and the valley VAL may be therecessed portion of the top surface of the third semiconductor patternSP3. For example, the valley VAL may be a recess formed on the topsurface of the third semiconductor pattern SP3. The valley VAL may be ona space between a pair of neighboring first active patterns AP1. Thefifth semiconductor pattern SP5 may fill the valley VAL of the thirdsemiconductor pattern SP3.

The valley VAL may be defined by connecting adjacent (111) planes of thetop surface of the third semiconductor pattern SP3 (see TS1 and TS2 ofFIG. 25B). The fifth semiconductor pattern SP5 may selectively cover the(111) planes that define the valley VAL of the third semiconductorpattern SP3. The fourth semiconductor pattern SP4 may cover other planesof the third semiconductor pattern SP3, which other planes are notcovered with the fifth semiconductor pattern SP5.

The fifth semiconductor pattern SP5 may include silicon-germanium(SiGe). The fifth semiconductor pattern SP5 may contain germanium (Ge)in an amount that is is greater than that of germanium (Ge) in thesecond semiconductor pattern SP2. The fifth semiconductor pattern SP5may have a germanium (Ge) content equal to or less than that of thethird semiconductor pattern SP3. For example, the germanium (Ge) contentof the fifth semiconductor pattern SP5 may be about 40 at % to about 75at %.

The body part BP of the first source/drain pattern SD1 may include afirst facet FA1 and a second facet FA2. The first facet FA1 and thesecond facet FA2 may face an adjacent second source/drain pattern SD2.The first facet FA1 and the second facet FA2 may be (111) planes. Thefirst facet FA1 and the second facet FA2 may define a first corner edgeSE1. The first corner edge SE1 may horizontally protrude toward theadjacent second source/drain pattern SD2.

The capping pattern CAP may be provided on the body part BP. Forexample, the capping pattern CAP may not cover the first facet FA1 andmay selectively cover the second facet FA2. The capping pattern CAP maynot cover, but expose the first corner edge SE1.

The first source/drain pattern SD1 may have a maximum width MW in thefirst direction D1 at a level at which the first corner edge SE1 islocated. The maximum width MW of the first source/drain pattern SD1 maybe substantially the same as that of the body part BP. This may bebecause that the capping pattern CAP does not cover the first corneredge SE1 and selectively covers the second facet FA2.

The silicide layer SC may be between the first source/drain pattern SD1and the active contact AC. The silicide layer SC may cover the third,fourth, and fifth semiconductor patterns SP3, SP4, and SP5. The silicidelayer SC may cover the capping pattern CAP. The capping pattern CAP mayhelp increase a contact area between the first source/drain pattern SD1and the active contact AC (or the silicide layer SC).

FIGS. 20, 22, 24, 26, and 28 illustrate plan views of a method ofmanufacturing a semiconductor device according to some exampleembodiments. FIGS. 21, 23A, 25A, 27A, and 29A illustrate cross-sectionalviews taken along line A-A′ of FIGS. 20, 22, 24, 26, and 28,respectively. FIGS. 23B, 25B, 27B, and 29B illustrate cross-sectionalviews taken along line B-B′ of FIGS. 22, 24, 26, and 28, respectively.FIGS. 23C, 25C, 27C, and 29C illustrate cross-sectional views takenalong line C-C′ of FIGS. 22, 24, 26, and 28, respectively. In theembodiment that follows, a repeated detailed description of technicalfeatures relative to those discussed with reference to FIGS. 1 to 14 maybe omitted, and a difference thereof will be discussed in detail.

Referring to FIGS. 20 and 21, a substrate 100 may be patterned to formactive patterns AP1 and AP2. The active patterns AP1 and AP2 may beformed to have at a regular interval (or pitch). A first trench TR1 maybe formed between a pair of neighboring active patterns AP1 and AP2. Thefirst trenches TR1 may have substantially the same depth.

The substrate 100 may be patterned to form a second trench TR2 thatdefines a PMOSFET region PR and a NMOSFET region NR. The second trenchTR2 may be formed deeper than the first trench TR1. One or more of theactive patterns AP1 and AP2 may be removed when the substrate 100 ispatterned, and thus first active patterns AP1 may remain on the PMOSFETregion PR and second active patterns AP2 may remain on the NMOSFETregion NR.

A device isolation layer ST may be formed to fill the first and secondtrenches TR1 and TR2. The formation of the device isolation layer ST mayinclude forming on the substrate 100 a dielectric layer (e.g., a siliconoxide layer) to cover the first and second active patterns AP1 and AP2,and recessing the dielectric layer until upper portions of the first andsecond active patterns AP1 and AP2 are exposed.

Referring to FIGS. 22 and 23A to 23C, sacrificial patterns PP may beformed to run across the first and second active patterns AP1 and AP2. Apair of gate spacers GS may be formed on opposite sidewalls of each ofthe sacrificial patterns PP. The gate spacers GS may also be formed onopposite sidewalls of the upper portion of each of the first and secondactive patterns AP1 and AP2.

Referring to FIGS. 24 and 25A to 25C, recesses RS may be formed on theupper portion of each of the first and second active patterns AP1 andAP2. A first hardmask pattern MP may be formed to selectively cover thesecond active patterns AP2. The first hardmask pattern MP may expose thefirst active patterns AP1. First source/drain patterns SD1 may be formedto fill the recesses RS of the exposed first active patterns AP1.

For example, a first semiconductor pattern SP1 may be formed in each ofthe recesses RS. A second semiconductor pattern SP2 may be formed oneach of the first semiconductor patterns SP1. A third semiconductorpattern SP3 may be formed on the second semiconductor patterns SP2adjacent to each other in a second direction D2. The formation of thethird semiconductor pattern SP3 may include growing epitaxial patternsusing the second semiconductor patterns SP2 as seed layers, and thenmerging the epitaxial patterns into a single piece. A fourthsemiconductor pattern SP4 may be formed on the third semiconductorpattern SP3. Except for that mentioned above, the formation of the firstto fourth semiconductor patterns SP1 to SP4 may be substantially thesame as that discussed above with reference to FIGS. 9 and 10A to 10C.

In an implementation, the formation of the first source/drain patternSD1 may further include forming a fifth semiconductor pattern SP5 on thethird semiconductor pattern SP3 before forming the fourth semiconductorpattern SP4. The first to fifth semiconductor patterns SP1 to SP5 mayconstitute a body part BP of the first source/drain pattern SD1.

The third semiconductor pattern SP3 may be formed to include valleysVAL. For example, the third semiconductor pattern SP3 may have a topsurface including a first surface TS1 and a second surface TS2 adjacentto each other. Each of the first and second surfaces TS1 and TS2 may bea (111) plane. The first surface TS1 and the second surface TS2 maydefine the valley VAL on the top surface of the third semiconductorpattern SP3.

The fifth semiconductor pattern SP5 may be formed by a selectiveepitaxial growth process in which the first and second surfaces TS1 andTS2 constituting the valley VAL are used as a seed layer. The fifthsemiconductor pattern SP5 may be formed to fill the valley VAL, and maynot be formed on different surfaces other than the first and secondsurfaces TS1 and TS2 of the third semiconductor pattern SP3. When theselective epitaxial growth process is adjusted on its process conditions(e.g., temperature, pressure, and etching gas amount), it may bepossible to control selective growth of the fifth semiconductor patternSP5 only on the first surface TS1 and the second surface TS2.

The body part BP may be formed to have a first facet FA1 and a secondfacet FA2. The first facet FA1 and the second facet FA2 may define afirst corner edge SE1. A capping pattern CAP may be selectively formedon the second facet FA2 of the body part BP. The capping pattern CAP maynot be formed on the first facet FA1 of the body part BP. The cappingpattern CAP may not cover the first corner edge SE1.

Referring to FIGS. 26 and 27A to 27C, second source/drain patterns SD2may be formed to fill the recesses RS of the second active patterns AP2.A first interlayer dielectric layer 110 may be formed on the substrate100. Each of the sacrificial patterns PP may be replaced with a gatedielectric pattern GI, a gate electrode GE, and a gate capping patternGP.

Referring to FIGS. 28 and 29A to 29C, a second interlayer dielectriclayer 120 may be formed on the first interlayer dielectric layer 110.Contact holes CNH may be formed to penetrate the second interlayerdielectric layer 120 and the first interlayer dielectric layer 110,exposing the first and second source/drain patterns SD1 and SD2.Silicide layers SC may be formed by performing a silicidation process onthe first and second source/drain patterns SD1 and SD2 exposed to thecontact holes CNH.

Referring back to FIGS. 18 and 19A to 19C, active contacts AC may beformed in the contact holes CNH, contacting the first and secondsource/drain patterns SD1 and SD2.

By way of summation and review, semiconductor devices may have highintegration with the advanced development of electronic industry. Forexample, semiconductor devices with high reliability, high speed, and/ormulti-functionality may be desirable. Semiconductor devices may begradually complicated and integrated to meet these characteristics.

According to an embodiment, a semiconductor device may be configuredsuch that a contact area between a source/drain pattern and an activecontact (or a silicide layer) is increased while the source/drainpattern maintains its maximum width. A resistance between thesource/drain pattern and the active contact may be reduced to helpimprove electrical characteristics of the semiconductor device.According to an embodiment, this may be realized by providing a cappinglayer.

One or more embodiments may provide a semiconductor device havingincreased integrated and reliability.

Example embodiments have been disclosed herein, and although specificterms are employed, they are used and are to be interpreted in a genericand descriptive sense only and not for purpose of limitation. In someinstances, as would be apparent to one of ordinary skill in the art asof the filing of the present application, features, characteristics,and/or elements described in connection with a particular embodiment maybe used singly or in combination with features, characteristics, and/orelements described in connection with other embodiments unless otherwisespecifically indicated. Accordingly, it will be understood by those ofskill in the art that various changes in form and details may be madewithout departing from the spirit and scope of the present invention asset forth in the following claims.

What is claimed is:
 1. A semiconductor device, comprising: a substrateincluding an active pattern; a gate electrode running across the activepattern; a source/drain pattern adjacent to one side of the gateelectrode and on an upper portion of the active pattern; an activecontact electrically connected to the source/drain pattern; and asilicide layer between the source/drain pattern and the active contact,wherein the source/drain pattern includes: a body part including aplurality of semiconductor patterns; and a capping pattern on the bodypart, wherein: the body part has a first facet, a second facet on thefirst facet, and a first corner edge defined where the first facet meetsthe second facet, the first corner edge extending parallel to thesubstrate, the capping pattern covers the second facet of the body partand exposes the first corner edge, the silicide layer covers a topsurface of the body part and a top surface of the capping pattern, thebody part includes: a first semiconductor pattern of the plurality ofsemiconductor patterns having a valley on a top surface of the firstsemiconductor pattern; a second semiconductor pattern of the pluralityof semiconductor patterns filling the valley; and a third semiconductorpattern that is an outermost one of the plurality of semiconductorpatterns, the first semiconductor pattern and the second semiconductorpattern include silicon-germanium, the third semiconductor patternincludes silicon, a silicon content of the third semiconductor patternis about 95 at % to about 100 at %, the first semiconductor pattern hasa third facet parallel to the first facet, a fourth facet parallel tothe second facet, and a second corner edge defined where the third facetmeets the fourth facet, and the third semiconductor pattern covers thethird facet, the fourth facet, and the second corner edge.
 2. Thesemiconductor device as claimed in claim 1, wherein: the capping patternincludes germanium, and a germanium content of the capping pattern isabout 5 at % to about 100 at %.
 3. The semiconductor device as claimedin claim 1, wherein the source/drain pattern has a maximum width at alevel at which the first corner edge is located.
 4. The semiconductordevice as claimed in claim 1, wherein the capping pattern exposes thefirst facet.
 5. The semiconductor device as claimed in claim 1, whereinthe capping pattern covers the first facet.
 6. The semiconductor deviceas claimed in claim 1, wherein: the active pattern includes a pluralityof active patterns that are adjacent to each other in an extendingdirection of the gate electrode, the source/drain pattern is on theplurality of active patterns, and the silicide layer covers the topsurface of the first semiconductor pattern and a top surface of thesecond semiconductor pattern.
 7. The semiconductor device as claimed inclaim 6, wherein: the third semiconductor pattern is between the firstsemiconductor pattern and the capping pattern, and the secondsemiconductor pattern is spaced apart from the capping pattern.
 8. Thesemiconductor device as claimed in claim 1, further comprising a deviceisolation layer that covers a lower sidewall of the active pattern onthe substrate, wherein the upper portion of the active pattern extendsvertically beyond the device isolation layer.
 9. A semiconductor device,comprising: a substrate including an active pattern; a gate electroderunning across the active pattern and extending in a first direction;and a source/drain pattern adjacent to one side of the gate electrodeand on an upper portion of the active pattern, wherein the source/drainpattern includes: a body part including a plurality of semiconductorpatterns; and a capping pattern on the body part, wherein the body parthas a first semiconductor pattern that is an outermost one of theplurality of semiconductor patterns and a second semiconductor patternbetween the first semiconductor pattern and the active pattern, thefirst semiconductor pattern including silicon in an amount of about 95at % to about 100 at % and the second semiconductor pattern includingsilicon-germanium, wherein the capping pattern includes germanium, agermanium content of the capping pattern being about 5 at % to about 100at %, wherein the capping pattern covers one facet of the firstsemiconductor pattern and exposes a corner edge of the body part, theone facet of the first semiconductor pattern being a (111) plane,wherein the source/drain pattern has a maximum width in the firstdirection at a level at which the corner edge is located, wherein thegermanium content of the capping pattern is greater than a germaniumcontent of the second semiconductor pattern, wherein the secondsemiconductor pattern has a third facet, a fourth facet, and a secondcorner edge defined where the third facet meets the fourth facet, andwherein the first semiconductor pattern covers the third facet, thefourth facet, and the second corner edge.
 10. The semiconductor deviceas claimed in claim 9, further comprising: an active contactelectrically connected to the source/drain pattern; and a silicide layerbetween the source/drain pattern and the active contact, wherein thesilicide layer covers a top surface of the body part and a top surfaceof the capping pattern.
 11. A semiconductor device, comprising: asubstrate including an active pattern; a gate electrode running acrossthe active pattern and extending in a first direction; and asource/drain pattern adjacent to one side of the gate electrode and onan upper portion of the active pattern, wherein the source/drain patternincludes: a body part including a plurality of semiconductor patterns;and a capping pattern on the body part, wherein the body part includes acorner edge that horizontally protrudes in the first direction, whereinthe capping pattern exposes the corner edge of the body part, wherein agermanium content of the capping pattern is greater than a germaniumcontent of the body part, wherein the source/drain pattern has a maximumwidth in the first direction at a level at which the corner edge islocated, wherein the corner edge is defined by a first facet and asecond facet of the body part, wherein each of the first facet and thesecond facet is a (111) plane, wherein the body part has a firstsemiconductor pattern that is an outermost one of the plurality ofsemiconductor patterns and a second semiconductor pattern between thefirst semiconductor pattern and the active pattern, wherein the secondsemiconductor pattern has a third facet parallel to the first facet, afourth facet parallel to the second facet, and a second corner edgedefined where the third facet meets the fourth facet, and wherein thefirst semiconductor pattern covers the third facet, the fourth facet,and the second corner edge.
 12. The semiconductor device as claimed inclaim 11, wherein the capping pattern covers one or more of the firstfacet and the second facet.
 13. The semiconductor device as claimed inclaim 11, further comprising: an active contact electrically connectedto the source/drain pattern; and a silicide layer between thesource/drain pattern and the active contact, wherein the silicide layercovers a top surface of the body part and a top surface of the cappingpattern.